Tony McQuay (L) wins the 400m race ahead of Jeremy Wariner (R) and Jamaal Torrence during the US track and field championships in Eugene, Oregon, Saturday. (AP) EUGENE, Oregon: Allyson Felix won the women's 400m at the US athletics championships Saturday and said she would decide soon if she would attempt a 200m-400m double at the World Championships. “Hopefully pretty soon,” Felix said of when a decision would come on the daunting double. Felix, the three-time defending 200m world champion, remains concerned that contesting the 400m prior to the 200m at the World Championships in Daegu, South Korea, Aug. 27-Sept. 4 could jeopardize her chances in her favorite event. In the meantime, however, she was savoring her 400m victory, which made her the first US woman to win national titles at 100m, 200m and 400m in a career. Felix powered through the finish to win in 50.40sec. In windy conditions, she couldn't match her 2011 world-leading 49.81sec, but she had plenty in the tank to beat Francena McCorory (50.49) and indoor world champion Debbie Dunn (50.70). In the men's 400m, university student Tony McQuay gave veteran Jeremy Wariner a glimpse of the future as Wariner tries to turn back the clock. McQuay surged past a fading Wariner in the final straight to win in 44.68sec. Wariner held on to take second in 44.98, but just barely as third went to Greg Nixon in the same time as all three booked their world berths. Warine noted that McQuay, with the collegiate season behind him, is further along in his training at this point. While the top three finishers here booked their spots in Daegu, the US could have another runner in the 400m at worlds. Reigning world champion LaShawn Merritt wasn't at the US championships as he completes a 21-month suspension after testing positive for a banned substance used in an over-the-counter male enhancement product. He has a bye into worlds and his suspension ends in time for him to race there. But he would need a waiver from USA Track and Field to compete without competing at the trials. David Oliver won the 110m hurdles in a time of 13.04sec, putting himself in position to challenge world record-holder Dayron Robles of Cuba and China's former world record-holder Liu Xiang in Daegu. Aries Merritt was second in 13.12 and Jason Richardson third in 13.15. Marquise Goodwin won the men's long jump with a leap of 8.33m ahead of rising talent Will Clay (8.19) and Jeremy Hicks (8.10). All were wind-aided. Reigning world champion Dwight Phillips, who has a bye into Daegu, finished a disappointing 10th with a leap of 7.89. Women's 100m champion Carmelita Jeter was the top qualifier into the semifinals of the 200m. With Tyson Gay injured and Justin Gatlin opting out, Shawn Crawford led the way into the men's 200m semis. Men's 100m winner Walter Dix advanced to keep alive his chance at a sprint double, something Gatlin decided not to attempt after a runner-up finish to Dix in the 100m put him back on a World Championships team after his four-year drugs ban. Wallace Spearmon, the 2009 World Championships bronze medalist, failed to advance.